The rating rules for the Vintage 10-Rater division are based on the 1948 Rating Rules for the 10-Rater Class by the Model Yachting Association of Great Britain and the Commonwealth.
The formula is:
Calculate V10R Rating
Calculate your rating for a Vintage 10-Rater from input LWL (in inches) and Sail Area (in square inches). Rating must be 10 or less for a conforming Vintage 10-Rater.
Calculate V10R Sail Area
Enter your LWL (in inches) to figure your maximum allowable Sail Area (in square inches).
Calculate V10R LWL
Enter your Sail Area (in square inches) to figure your maximum allowable LWL (in inches).